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I Ching Birth Hexagram · Hexagram 27 of 64

Hexagram 27, 頤 Yí: the open mouth between two jaws

頤 Yí is hexagram 27 of the Zhouyi, which puts thunder under a mountain, and the figure itself looks like an open mouth: a whole line for each jaw and four broken lines between. The character means the jaws and so to nourish, and the Judgment asks what one feeds and how one seeks one's own food.

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Hexagram 27, 頤 Yí, drawn as six lines numbered from the bottom: whole, broken, broken, broken, broken, whole. The lower, inner trigram is 震 Zhèn, Thunder; the upper, outer trigram is 艮 Gèn, Mountain. 1 2 3 4 5 6 Upper, outer 艮 Gèn, Mountain Lower, inner 震 Zhèn, Thunder 27 頤 Yí Lines numbered from the bottom
The figure of 頤 from the bottom line up: Thunder inside, Mountain outside. Four broken lines, two whole.

Facts

Number
27 of 64, in the received order
Character and pinyin
頤 Yí ䷚
Our title
Nourishment
Lines, bottom to top
yang, yin, yin, yin, yin, yang
Lower trigram (inner)
☳ 震 Zhèn, Thunder
Upper trigram (outer)
☶ 艮 Gèn, Mountain
Within (nuclear)
2 坤 Kūn, Earth's Yielding
King Wen pair
28 大過 Dà Guò, Great Excess
Legge's name (1882)
Î
Part of the text
The first part (上經), 1 to 30

Meaning

The picture is in the lines: a whole line at the top and at the bottom, the jaws, and four broken lines between them, the open mouth. 頤 means the jaw or the cheeks, and from there to nourish; the trigrams add movement below, thunder, and stillness above, the mountain, as the lower jaw moves and the upper stays still. The Judgment promises good fortune to the correct and then turns the question on the reader: look at what is being nourished, and at how one seeks nourishment for oneself.

The Image names the mouth's two traffic: words go out and food comes in, so the superior man watches his words and is moderate in what he eats and drinks. In our reading 頤 is nourishment in the widest sense, of the body, of others and of character. It reads the same upside down, and its opposite, every line flipped, is hexagram 28, where too much rests on too little.

The lines

The lower lines seek their food the wrong way. The first leaves its own "efficacious tortoise", in Legge's English, to gape at someone else's meal; the second looks down for nourishment, or up to the heights, and either way goes wrong; the third acts against the way of nourishing altogether. The upper lines look downward to feed others instead. The fourth gazes down like a tiger, intent and unwavering, and is not blamed; the fifth departs from the usual course and keeps firm. The top line is the source of nourishment for all, in a place of danger, and the great stream can be crossed.

Within 頤 lies 坤, hexagram 2; its pair and opposite is 大過, hexagram 28.

In the birth cast

The time cast arrives at 頤 when the year, month and day leave 7 on eight, which puts 艮 mountain above, and the same total with the hour added leaves 4, which puts 震 thunder below. Which line moves depends on what the whole total leaves on six, and each line turns the figure into a different hexagram:

  • Line 1 (初九) moving: becomes 23 剝 Bō, Stripping Away
  • Line 2 (六二) moving: becomes 41 損 Sǔn, Decrease
  • Line 3 (六三) moving: becomes 22 賁 Bì, Adornment
  • Line 4 (六四) moving: becomes 21 噬嗑 Shì Kè, Closing the Jaws
  • Line 5 (六五) moving: becomes 42 益 Yì, Increase
  • Line 6 (上九) moving: becomes 24 復 Fù, Return

Lines 2 to 5 give the hexagram within, 2 坤 Kūn, Earth's Yielding. Everyone born in the same lunar day and double hour has the same cast, so the figure describes a moment, not a person.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

Trigram virtues (Shuogua, chapter 7)
震 moving, startling below; 艮 stopping, at rest above, in our English sourced
Trigram family places (Shuogua)
eldest son below, youngest son above sourced
Trigram body and animal images (Shuogua)
feet and dragon below; hands and dog above sourced
Trigram phases (a classical correspondence: the Plum Blossom text's table)
Wood below, Earth above. The Han assignment of 梅花易數, book 1, also used by Jing Fang; not stated as such in the Zhouyi sourced
Inverse and opposite
Upside down it is itself; every line flipped: 28 大過 Dà Guò, Great Excess sourced
Human Design gate
Gate 27, from 32° to 37.625° of the tropical zodiac on Ra Uru Hu's wheel (1987): a modern placing, not the I Ching's sourced
Our English title
Nourishment: EsoTerrier's own, from the sense of 頤 our construction

How the schools read it

The Zhouyi, in Legge's translation (1882)
“We must look at what we are seeking to nourish, and by the exercise of our thoughts seek for the proper aliment.”
The Image (大象), one of the Wings, in our paraphrase
Thunder at the foot of a mountain; the superior man watches over his words and is temperate in eating and drinking.
The Plum Blossom method (Ming)
A figure reached by numbers: 艮 above when the year, month and day leave 7 on eight, 震 below when the same total with the hour leaves 4.
Human Design (Ra Uru Hu, 1987)
Takes the number for its gate 27 and puts it on the zodiac; its own reading, which we do not quote.
EsoTerrier
Thunder under the mountain, the shape of an open mouth: what one takes in and what one feeds to others, with care in words and moderation in what one takes.

Claims about it

  • Gate 27 of Human Design, at 32° to 37.625° of the zodiac, is where the I Ching itself places hexagram 27.

    false

    What the record shows: The wheel is Shao Yong's circle rotated by Ra Uru Hu in 1987 to 1989 so that hexagram 41 starts at 2° Aquarius. No Chinese source we found puts the hexagrams on degrees of the zodiac.

  • Being born under 頤 Yí fixes a person's character.

    unverified

    What the record shows: A modern reading with no source in the tradition. The Zhouyi has no birth hexagram; the cast reads a figure, not a person, and everyone born in the same lunar day and double hour shares it.

Elsewhere on EsoTerrier

Sources

Primary texts (6)
  1. James Legge (trans.), The Yî King, Sacred Books of the East XVI. Oxford: Clarendon Press, 1882. Public domain; quoted briefly and credited. en.wikisource.org/wiki/Sacred_Books_of_the_East/Volume_16
  2. 梅花易數 (Meihua yishu, the Plum Blossom method), attributed to Shao Yong, book 1: the time rule, the trigram numbers and phases, and the casts of the plum blossom and the peonies. zh.wikisource.org/wiki/梅花易數/卷一
  3. 周易 (Zhouyi), the received Chinese text of the hexagram and line statements with the Ten Wings. ctext.org/book-of-changes
  4. The same, the 1882 Oxford edition scanned (archive.org), for hexagrams 33 to 64 and the appendices. archive.org/details/sacredbooksofchi16conf
  5. The Unicode Standard, Yijing Hexagram Symbols, U+4DC0 to U+4DFF. unicode.org/charts/PDF/U4DC0.pdf
  6. 京氏易傳 (Jingshi yizhuan), attributed to Jing Fang, three books. zh.wikisource.org/wiki/京氏易傳
Studies and other sources (3)
  1. "King Wen sequence", Wikipedia. en.wikipedia.org/wiki/King_Wen_sequence
  2. Jovian Archive, "Gates and hexagrams in Human Design" (cited for the wheel's origin only). jovianarchive.com/pages/gates-and-hexagrams-in-human-design
  3. "Hexagram (I Ching)", Wikipedia. en.wikipedia.org/wiki/Hexagram_(I_Ching)
Our own research (5)
  1. EsoTerrier, I Ching research, 10 to 14 October 2026: the method, the validation (61 births), the variants and the lists.
  2. EsoTerrier calculation engine, the I Ching service and its reference tables (titles, glosses and readings our own).
  3. EsoTerrier, Gene Keys research, 9 October 2026: the legal and trade-mark report, on which hexagram names are free to use.
  4. EsoTerrier, Human Design research, 9 October 2026: the wheel, gate 41 at 2° Aquarius, 5.625° per gate.
  5. EsoTerrier, engine audit of 14 October 2026: the reworded titles, readings and trigram qualities, with the passages each rests on.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 19 October 2026. How we write these pages.

First published ; last revised . Corrections: support@esoterrier.com.